Alert archive / Iowa / Flash Flood Warnings in 1996

Flash Flood Warning 12, NWS Omaha, NE

June 21, 1996Harrison County, Shelby County, Iowa

NWS Omaha, NE issued this flash flood warning at Jun 21, 1996, 6:20 AM CDT for Harrison County, Shelby County, Iowa. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 21, 1996, 6:20 AM CDT (11:20 UTC)
Expired
Jun 21, 1996, 10:00 AM CDT
In force
4 hr
Issued by
NWS Omaha, NE
Area
Whole counties

Counties Harrison County, IA, Shelby County, IA

The radar

The Omaha radar (KOAX), 78 km from the middle of the area, began a volume at 11:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 11.3 hours before the alert went out and 78 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 1996-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2363 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 1996-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2363 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1424 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
276 m²/s²
Significant tornado parameter
2.1
Supercell composite
19.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 21, 12:20 AM CDT, 6 hours before
NEZ004-005-022-023-035-056>058-069-210620-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1219 AM CDT (1119 PM MDT) FRI JUN 21 1996

...SEVERE THUNDERSTORM WATCH 650 CANCELLED FOR PORTIONS OF WESTERN
    NEBRASKA...

SEVERE THUNDERSTORM WATCH NUMBER 650 IS NO LONGER IN EFFECT FOR THE
FOLLOWING COUNTIES OF WESTERN NEBRASKA...

SHERIDAN...CHERRY...GARDEN...GRANT...DEUEL AND ARTHUR.

THE WATCH CONTINUE IN EFFECT UNTIL 1AM CDT/MFIDNIGHT FOR AREAS OF
SOUTHWEST NEBRAASKA INCLUDING KEITH...PERKINS AND CHASE COUNTIES.

GW
Special weather statement, Jun 21, 3:57 AM CDT, 2 hours 23 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Jun 21, 4:49 AM CDT, 1 hour 31 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Jun 21, 5:37 AM CDT, 43 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 7:01 PM CDTSevere Thunderstorm WarningOAXCuming, Stanton59 min
Jun 20, 7:10 PM CDTTornado WarningOAXBurt35 min
Jun 20, 7:20 PM CDTSevere Thunderstorm WarningOAXWashington55 min
Jun 20, 7:30 PM CDTSevere Thunderstorm WarningOAXDodge30 min
Jun 20, 7:39 PM CDTTornado WarningOAXWashington36 min
Jun 20, 7:56 PM CDTSevere Thunderstorm WarningOAXCuming, Dodge64 min
Jun 20, 8:16 PM CDTSevere Thunderstorm WarningOAXWashington59 min
Jun 20, 8:27 PM CDTTornado WarningOAXDodge48 min
Jun 20, 8:58 PM CDTTornado WarningOAXWashington47 min
Jun 20, 9:00 PM CDTFlash Flood WarningOAXColfax, Cuming, Dodge5 hr
Jun 20, 9:14 PM CDTTornado WarningOAXDodge31 min
Jun 20, 9:26 PM CDTTornado WarningOAXColfax, Platte49 min
Jun 20, 9:43 PM CDTTornado WarningOAXWashington47 min
Jun 20, 9:46 PM CDTTornado WarningOAXSaunders44 min
Jun 20, 9:55 PM CDTTornado WarningOAXDodge35 min
Jun 20, 10:03 PM CDTTornado WarningOAXDouglas57 min
Jun 20, 10:09 PM CDTSevere Thunderstorm WarningOAXButler, Colfax66 min
Jun 20, 10:20 PM CDTTornado WarningOAXButler, Saunders55 min
Jun 20, 10:26 PM CDTTornado WarningOAXWashington49 min
Jun 20, 10:55 PM CDTTornado WarningOAXDouglas50 min
Jun 20, 11:09 PM CDTTornado WarningOAXButler, Saunders66 min
Jun 20, 11:20 PM CDTFlash Flood WarningOAXButler, Saunders6 hr
Jun 20, 11:49 PM CDTSevere Thunderstorm WarningOAXCass, Sarpy56 min
Jun 20, 11:49 PM CDTSevere Thunderstorm WarningOAXLancaster56 min
Jun 21, 12:26 AM CDTSevere Thunderstorm WarningOAXButler, Seward64 min
Jun 21, 12:47 AM CDTTornado WarningOAXSeward43 min
Jun 21, 12:52 AM CDTTornado WarningOAXCass68 min
Jun 21, 12:57 AM CDTTornado WarningOAXCass63 min
Jun 21, 1:59 AM CDTSevere Thunderstorm WarningOAXDodge, Washington46 min
Jun 21, 2:00 AM CDTSevere Thunderstorm WarningOAXBurt, Cuming45 min
Jun 21, 3:51 AM CDTSevere Thunderstorm WarningOAXColfax, Platte54 min
Jun 20, 9:55 PM CDTTornado WarningOAXFremont35 min
Jun 21, 1:10 AM CDTSevere Thunderstorm WarningOAXMonona50 min
Jun 21, 2:39 AM CDTSevere Thunderstorm WarningOAXHarrison, Monona51 min
Jun 21, 3:32 AM CDTSevere Thunderstorm WarningOAXMonona28 min
Jun 21, 4:48 AM CDTFlash Flood WarningOAXMonona5 hr
Jun 21, 11:59 AM CDTFlash Flood WarningOAXHarrison6 hr
Jun 21, 4:11 PM CDTFlash Flood WarningOAXHarrison6 hr

Nearby

Flash Flood Warnings in Iowa, 1996Every flash flood warning in 1996

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.